John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs,...
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Transcript of John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs,...
![Page 1: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/1.jpg)
John Ellis
Physics Challenges at the High-Energy Frontier
Where do we go from here?
After the Higgs, LHC Run 1
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Open Questions beyond the Standard Model
• What is the origin of particle masses?
due to a Higgs boson?• Why so many types of matter particles?• What is the dark matter in the Universe?• Unification of fundamental forces?• Quantum theory of gravity?
LHC
![Page 3: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/3.jpg)
Theoretical Confusion
• High mortality rate among theories• (MH, Mt) close to stability bound
• Split SUSY? High-scale SUSY? • Modify/abandon naturalness? Does Nature care?• String landscape? • SUSY anywhere better than nowhere• SUSY could not explain the hierarchy• New ideas needed!
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Projected e+e- Colliders:Luminosity vs Energy
![Page 5: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/5.jpg)
• Future runs of the LHC:– Run 2: 30/fb @ 13/14 TeV– Run 3: 300/fb @ 14 TeV
• HL-LHC: 3000/fb @ 14 TeV?(advanced planning, not formally approved)
• HE-LHC: 3000/fb @ 33 TeV??(high-field magnets in the LHC tunnel)
• VHE-LHC: 3000/fb @ 100 TeV??(high-field magnets in 80/100 km tunnel)
Proton-Proton Colliders:Luminosity and Energy
![Page 6: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/6.jpg)
July 4th 2012
The discovery of a new particle
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Global Analysis of Higgs-like Models
• Rescale couplings: to bosons by a, to fermions by c
• Standard Model: a = c = 1JE & Tevong You, arXiv:1303.3879
b bbarτ τγ γW WZ ZGlobal
No evidence for
deviation from SM
![Page 8: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/8.jpg)
It Walks and Quacks like a Higgs
• Do couplings scale ~ mass? With scale = v?
• Red line = SM, dashed line = best fitJE & Tevong You, arXiv:1303.3879
Global
fit
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What Next: A Higgs Factory?
To study the ‘Higgs’ in detail:• The LHC
– Rethink LHC upgrades in this perspective?• A linear collider?
– ILC up to 500 GeV– CLIC up to 3 TeV
(Larger cross section at higher energies)
• A circular e+e- collider: LEP3, …– A photon-photon collider: SAPPHiRE
• A muon collider
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Possible High-Luminosity LHC Measurements
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Possible Future Higgs Measurements
• Need to reduce theoretical uncertainties to match• Essential for new physics interpretations
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Possible Future Higgs Measurements
Janot
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H Coupling Measurements Now@TLEPM = 246.0 ± 0.8 GeV, ε = 0.0000+0.0015
-0.0010
JE & Tevong You
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CLIC Higgs Measurements
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CLIC Higgs Measurements
Mass dependence of H couplings Sensitivity to composite H models
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Higgs Cross-Sections @ HE/VHE-LHC
VHE-LHC physics
Studies just starting
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• Predictions of current best fits in simple SUSY models
• Current uncertainties in SM calculations [LHC Higgs WG]
• Comparisons with– LHC– HL-LHC– ILC– TLEP
• Don’t decide before LHC 13/4
Impact of Higgs Measurements
K. De Vries
(MasterCode)
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Possible TLEP Precision Measurements
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Theoretical Constraints on Higgs Mass
• Large Mh → large self-coupling → blow up at low-energy scale Λ due to renormalization
• Small: renormalization due to t quark drives quartic coupling < 0at some scale Λ→ vacuum unstable
• Vacuum could be stabilized by SupersymmetryDegrassi, Di Vita, Elias-Miro, Giudice, Isodori & Strumia, arXiv:1205.6497
Instability @
1010 – 1013 GeV
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TLEP Measurements of mt & MW
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What else is there?
Supersymmetry• Successful prediction for Higgs mass
– Should be < 130 GeV in simple models
• Successful predictions for couplings– Should be within few % of SM values
• Naturalness, GUTs, string, … (???)
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Data
• Electroweak precision observables
• Flavour physics observables
• gμ - 2
• Higgs mass• Dark matter• LHC
MasterCode: O.Buchmueller, JE et al.
Deviation from Standard Model:
Supersymmetry at low scale, or …?
MH = 125.6 ± 0.3 ± 1.5 GeV
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Search with ~ 20/fb @ 8 TeV
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O. Buchmueller, R. Cavanaugh, M. Citron, A. De Roeck, M.J. Dolan, J.E., H. Flacher, S. Heinemeyer, G. Isidori,
J. Marrouche, D. Martinez Santos, S. Nakach, K.A. Olive, S. Rogerson, F.J. Ronga, K.J. de Vries, G. Weiglein
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p-value of simple models ~ 5% (also SM)
2012 20/fb
Scan of CMSSM
Buchmueller, JE et al: arXiv:1312.5250
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Confronted with likelihood analysis of CMSSM
LHC Reach for Supersymmetry
K. De Vries
(MasterCode)
![Page 27: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/27.jpg)
51 20/fb2012
Squark mass
CMSSM
Favoured values of squark mass also significantly
above pre-LHC, > 1.6 TeV
Buchmueller, JE et al: arXiv:1312.5250
Reach of LHC at
High luminosity
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51 20/fb2012
CMSSM
Favoured values of gluino mass significantly
above pre-LHC, > 1.8 TeV
Buchmueller, JE et al: arXiv:1312.5250
Gluino mass
CMSSM
Reach of LHC at
High luminosity
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CLIC Capabilitiesfor
Supersymmetry
Possible cross-sections
Possible measurement errors
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CLIC Sensitivity to BSM Physics
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Confronted with likelihood analysis of CMSSM
Direct Reach for Supersymmetry
Stau mass contours
500 GeV
(ILC1000)
1500 GeV
(CLIC)
TLEP, ILC500
have no impact
K. De Vries
(MasterCode)
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ΓZ constraint on (m0, m1/2) plane in CMSSM:All points within one current σ of present best-fit value
Impact of LEP Precision on Susy
K. De Vries
(MasterCode)
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ΓZ constraint on (m0, m1/2) plane in CMSSM:Points within one, two, three TLEP σ of present best-fit value
Impact of TLEP Precision on Susy
K. De Vries
(MasterCode)
![Page 34: John Ellis Physics Challenges at the High-Energy Frontier Where do we go from here? After the Higgs, LHC Run 1.](https://reader036.fdocuments.in/reader036/viewer/2022062309/5697bfd31a28abf838cac5d7/html5/thumbnails/34.jpg)
tt & Supersymmetry @ HE/VHE-LHC_
VHE-LHC physics
Studies just starting
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Reaches for Sparticles
@ LHC, HE-LHC, VHE-LHC
VHE-LHC physics
Studies just starting
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Future Accelerators• (What) precision, (how) high energy, neutrinos?• Which is THE top priority accelerator?
– Precision: HL-LHC, ILC/CLIC, TLEP, MC, γγ– Energy: HE-LHC, VHE-LHC, CLIC, MC– Neutrinos: from superbeam to ν factory
• HL-LHC is not a done deal, needs high-tech: – 11T dipoles, 13T quads, 500m HTS link, crab cavities
• Worldwide collaboration needed• No decision before LHC 13/14 TeV results
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The Twin Pillars of TLEP Physics
Precision Measurements • Springboard for
sensitivity to new physics
• Theoretical issues:– Higher-order QCD– Higher-order EW– Mixed QCD + EW
• Experimental issues– Patrick
Rare Decays• Direct searches for new
physics• Many opportunities• Z: 1012
• b, c, τ: 1011
• W: 108
• H: 106
• t: 106
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MW constraint on (m0, m1/2) plane in CMSSM:All points within one current σ of present best-fit value
Impact of TLEP Precision on Susy
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Rl constraint on (m0, m1/2) plane in CMSSMPoints within one, two, three TLEP σ of present best-fit value
Impact of TLEP Precision on Susy
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MW constraint on stop mass
Impact of TLEP Precision on Susy
sin2θW constraint on stop mass
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Impact of Precise Measurement of ΓZ
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Indirect Sensitivity to 3h Coupling
• Loop corrections to σ(H+Z):
• 3h correction δh energy-dependent
• δZ energy-independent: can distinguish
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cf, LEP and LHC• “Those who don't know history are doomed
to repeat it…”–Edmund Burke
• “… and maybe also those who do.”• LEP: Precision Z studies, W+W-,
search for Higgs, anything else• LHC: search for Higgs, anything else• Do not decide anything until LHC 13/4
✔ ✔✖ ✖
✔ ?